We look at the division of 90507015 by 109 
The aim is to understand the frequency of 109 in 90507015.

Going ahead to step 1:
If we divide 9 by 109, we get 0 and a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 109

Moving on to step 2:
90 divided by 109 is 0 with a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 90 to get 90.
Append the next digit (5) from the dividend to 90 and continue with: 905 / 109

Advancing to step 3:
If we divide 905 by 109, we get 8 and a remainder of 33.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 872 from 905 to get 33.
Include the next digit (0) from the dividend after 33, then repeat: 330 / 109

Moving on to step 4:
109 goes into 330 3 times with a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 83.0
Subtract 327 from 330 to get 3.
Grab the next digit (7) from the dividend, add it to 3, then carry on: 37 / 109

Going ahead to step 5:
109 goes into 37 0 times with a remainder of 37.
The next digit of our result is 0. 
Result so far: 830.0
The remainder is 37 after subtracting 0 from 37.
Include the next digit (0) from the dividend after 37, then repeat: 370 / 109

Step 6:
When dividing 370 by 109, we get 3 with a remainder of 43.
Record the quotient 3 as the next digit in the result. 
Result so far: 8303.0
Subtract 327 from 370 to get 43.
Fetch the next digit (1) from the dividend, attach it to 43 and continue: 431 / 109

On to step 7:
The number 109 fits into 431 3 times, leaving a remainder of 104.
Write down 3 as next digit of the result. 
Result so far: 83033.0
Subtract 327 from 431 to get 104.
Include the next digit (5) from the dividend after 104, then repeat: 1045 / 109

Let's proceed to step 8:
109 can be fit into 1045 9 times, resulting in a remainder of 64.
Use 9 as the next digit of our solution. 
Result so far: 830339.0
Deduct 981 from 1045 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 9:
The number 109 fits into 640 5 times, leaving a remainder of 95.
Record the quotient 5 as the next digit in the result. 
Result so far: 830339.5
If we subtract 545 from 640, we get 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Let's proceed to step 10:
The number 109 fits into 950 8 times, leaving a remainder of 78.
Put 8 as the next digit of the answer. 
Result so far: 830339.58
If we take 872 away from 950, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Step 11:
If we divide 780 by 109, we get 7 and a remainder of 17.
Record the quotient 7 as the next digit in the result. 
Result so far: 830339.587
If we take 763 away from 780, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 12:
109 can be fit into 170 1 times, resulting in a remainder of 61.
The next digit of our result is 1. 
Result so far: 830339.5871
Subtracting 109 from 170 leaves us with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Let's proceed to step 13:
109 goes into 610 5 times with a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 830339.58715
If we subtract 545 from 610, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 14:
If we divide 650 by 109, we get 5 and a remainder of 105.
Put 5 as the next digit of the answer. 
Result so far: 830339.587155
If we take 545 away from 650, we end up with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Our division results in 830339.587155 with a remaining 1.05e-05.